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Revenue from Contracts with Customers (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jul. 01, 2018 | Apr. 01, 2018 | Dec. 31, 2017 | Oct. 01, 2017 | Jul. 02, 2017 | Apr. 02, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net Sales | $ 447.5 | $ 464.1 | $ 464.7 | $ 431.3 | $ 432.1 | $ 424.5 | $ 414.1 | $ 405.0 | $ 1,807.6 | $ 1,675.7 | $ 1,638.0
Metalcasting [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 328.9 | 294.3 | 258.0
Household, Personal Care and Specialty Products [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 248.8 | 169.6 | 171.2
Environmental Products [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 80.3 | 67.7 | 78.9
Building Materials [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 70.4 | 78.2 | 74.1
Basic Minerals [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 99.7 | 125.0 | 103.9
Paper PCC [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 378.5 | 377.7 | 387.9
Specialty PCC [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 66.9 | 66.0 | 64.3
Ground Calcium Carbonate [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 91.0 | 87.3 | 83.6
Talc [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 52.9 | 53.8 | 55.7
Refractory Products [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 261.1 | 226.9 | 219.0
Metallurgical Products [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 50.8 | 52.5 | 55.5
Performance Materials [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net Sales | 206.8 | 219.5 | 214.5 | 187.3 | 195.8 | 188.8 | 180.3 | 169.9 | 828.1 | 734.8 | 686.1
Performance Materials [Member] | Metalcasting [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 328.9 | 294.3 | 258.0
Performance Materials [Member] | Household, Personal Care and Specialty Products [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 248.8 | 169.6 | 171.2
Performance Materials [Member] | Environmental Products [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 80.3 | 67.7 | 78.9
Performance Materials [Member] | Building Materials [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 70.4 | 78.2 | 74.1
Performance Materials [Member] | Basic Minerals [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 99.7 | 125.0 | 103.9
Specialty Minerals [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net Sales | 142.5 | 146.3 | 150.9 | 149.6 | 143.9 | 147.7 | 147.0 | 146.2 | 589.3 | 584.8 | 591.5
Specialty Minerals [Member] | Paper PCC [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 378.5 | 377.7 | 387.9
Specialty Minerals [Member] | Specialty PCC [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 66.9 | 66.0 | 64.3
Specialty Minerals [Member] | Ground Calcium Carbonate [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 91.0 | 87.3 | 83.6
Specialty Minerals [Member] | Talc [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 52.9 | 53.8 | 55.7
Refractories [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net Sales | 77.9 | 79.1 | 79.6 | 75.3 | 71.3 | 69.0 | 68.9 | 70.2 | 311.9 | 279.4 | 274.5
Refractories [Member] | Refractory Products [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 261.1 | 226.9 | 219.0
Refractories [Member] | Metallurgical Products [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 50.8 | 52.5 | 55.5
Energy Services [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net Sales | $ 20.3 | $ 19.2 | $ 19.7 | $ 19.1 | $ 21.1 | $ 19.0 | $ 17.9 | $ 18.7 | $ 78.3 | $ 76.7 | $ 85.9

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